ax6bc pro and cpu speed problem, pls help

I have a piii 600/133 running on a ax6bc pro mobo.a few weeks ago i installed a new hard drive the thing is now the cpu is running at 300 mhz instead of 600.also the bios doesn't let me change the cpu speed.what have i done wrong? any ideas how can i correct it?

<crustybunker@home.com> wrote in messagenews:Atvsc.7899$oM.180576@news.ono.com...> I have a piii 600/133 running on a ax6bc pro mobo.> a few weeks ago i installed a new hard drive> the thing is now the cpu is running at 300 mhz instead of 600.> also the bios doesn't let me change the cpu speed.> what have i done wrong? any ideas how can i correct it?>> much appreciated>> cb

Your board is probably locking the multiplier at 4.5, which is what your CPUis built to. The board is not capable of running a 133FSB CPU unless itclocks down to 100MHz, or you overclock it. The board is designed tooverclock to 133FSB, but the problem is that this also increases the AGP Busfrom 66MHz to 83MHz which could cause damaged or a non-POSTing system. Also,a BIOS upgrade will allow you to control the FSB and multiplier better. Youcan try to update the BIOS and then try upping the multiplier and FSB untilyou have stability problems. For instance, you may be able to clock the CPUto something like a 5.5 multiplier and a 108FSB, which would run the CPU at594 MHz, but the only way to know how far you can go is to try it and see. Ahi quality CPU heatsink and fan will help you get the numbers higher. Thelast option is a Powerleap adapter for the CPU, but these are a bit pricey.The nice thing is that most Pentium boards will run up to a 1.4GHz CPU withthe adapter.

Chris

"Wesley" <noo@email.com> wrote in messagenews:pGxtc.14016$L.2895@news-server.bigpond.net.au...>> <crustybunker@home.com> wrote in message> news:Atvsc.7899$oM.180576@news.ono.com...> > I have a piii 600/133 running on a ax6bc pro mobo.> > a few weeks ago i installed a new hard drive> > the thing is now the cpu is running at 300 mhz instead of 600.> > also the bios doesn't let me change the cpu speed.> > what have i done wrong? any ideas how can i correct it?> >> > much appreciated> >> > cb>> this board is 100 FSB but dunno about 133 bit work out to do...>>>

>I have a piii 600/133 running on a ax6bc pro mobo.>a few weeks ago i installed a new hard drive >the thing is now the cpu is running at 300 mhz instead of 600.>also the bios doesn't let me change the cpu speed.>what have i done wrong? any ideas how can i correct it?>

I had the ax6bc and liked it much. But I don't remember the bios indetails.

Set fsb to 133 and beware if pci divider should be set to 1/4 or isauto. The agp divider cannot be set lower than 2/3. This means that atfsb133 the agp is overclocked by 33%, but many graphics cards canhandle that easy, and since you have run so before, you might be luckyto have a good one.

I have used the ax6bc with a celeron tualatin at 13-1400 MHz. Theceleron tualatin has the same 2nd level cache, 256 kbyte, as thecoppermine P3 you have now.

A cheap adapter is the slot-T adapter, that is compatible with ax6bc. www.upgradeware.com and see dealer information. It can be boughtinternationally from per example Germany or Holland.

The powerleap adapter is much more expensive since it has its ownvoltage regulator. It recieves 5 volt as a harddisk and makes thecorrect voltage (1.5 volt for tualatin). But the voltage regulator ofax6bc can handle 1.5 volt itself. The powerleap adapter is for olderboards not able to do that.